Expand Linear Regression Comparison

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CAMIS/Comp/r-sas_linear-regression.qmd

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	### Summary of R vs SAS Comparison for Linear Regression {.unnumbered}
	To date the `lm` function in R and `proc reg` in sas have been found to 100% agree.
	See [R](https://psiaims.github.io/CAMIS/R/linear-regression.html) and [SAS](https://psiaims.github.io/CAMIS/SAS/linear-regression.html) for more detail.

This needs expanding to look more like the template. Also given R, SAS, and Python all use the same dataset it is easy to add Python into the comparison as well